OPTICAL MODULE AND OPTICAL TRANSMITTER

Provided is an optical module comprising a plate-like metal stem and a semiconductor optical modulation element mounted to a dielectric substrate provided on one side of the metal stem, wherein the metal stem has a metal stem penetration section in which a metal lead pin is inserted coaxially in a penetration hole which is formed in the metal stem and a dielectric member is provided to fill the penetration hole around the outer circumference of the lead pin, and a signal for modulation is supplied to the semiconductor optical modulation element connected in parallel with a terminal matching circuit, from the other side of the metal stem via the metal stem penetration section, wherein the terminal matching circuit is configured by a series connecting body which is comprised of a first resistor and a parallel body which is comprised of a second resistor and a capacitor.